We found this circuit in a 1969 Mullard documentation. The same configuration appears elsewhere in this section. The control range is -2 dB to 19.5 dB at 30 Hz.
We found this transmitter in 1980s documentation. Coil data is found next to the diagram and...
In the figure we have the configuration of the circuit as a conventional Darlington. In this...
This circuit is from a 1977 publication and is characterized by an adjustment of the polarization point of...